content: /*
   * Copyright 2017 David Karnok
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package hu.akarnokd.reactive4javaflow.impl.operators;
  
  import hu.akarnokd.reactive4javaflow.*;
  import hu.akarnokd.reactive4javaflow.functionals.CheckedFunction;
  import hu.akarnokd.reactive4javaflow.fused.ConditionalSubscriber;
  import hu.akarnokd.reactive4javaflow.impl.EmptySubscription;
  import hu.akarnokd.reactive4javaflow.processors.CachingProcessor;
  
  import java.util.Objects;
  import java.util.concurrent.Flow;
  
  public final class FolyamReplay<T, R> extends Folyam<R> {
  
      final Folyam<T> source;
  
      final CheckedFunction<? super Folyam<T>, ? extends Flow.Publisher<? extends R>> handler;
  
      final int capacityHint;
  
      public FolyamReplay(Folyam<T> source, CheckedFunction<? super Folyam<T>, ? extends Flow.Publisher<? extends R>> handler, int capacityHint) {
          this.source = source;
          this.handler = handler;
          this.capacityHint = capacityHint;
      }
  
      @Override
      protected void subscribeActual(FolyamSubscriber<? super R> s) {
          CachingProcessor<T> mp = CachingProcessor.withCapacityHint(capacityHint);
          Flow.Publisher<? extends R> p;
          try {
              p = Objects.requireNonNull(handler.apply(mp), "The handler returned a null Flow.Publisher");
          } catch (Throwable ex) {
              EmptySubscription.error(s, ex);
              return;
          }
  
          if (s instanceof ConditionalSubscriber) {
              p.subscribe(new FolyamPublish.PublishConditionalSubscriber<>((ConditionalSubscriber<? super R>)s, mp));
          } else {
              p.subscribe(new FolyamPublish.PublishSubscriber<>(s, mp));
          }
  
          source.subscribe(mp);
      }
  }
  